icontrol - policy-diff and merge

I tried the guide at https://cdn.f5.com/websites/devcentral.f5.com/downloads/icontrol-rest-api-user-guide-16-1-0.pdf but I get the restjavad log error below:

[SEVERE][252][10 Apr 2023 12:51:35 UTC][com.f5.rest.workers.asm.AsmConfigWorker] nanoTime:[3661835037124] threadId:[24] Exception:[ASMConfigException(error_message:Could not parse/validate the Policy Diff Task. Invalid reference for secondPolicyReference ('test-signature'), error_code:UNKNOWN, internal_error:Failed parse/validate for PolicyDiffTask found -- parse/validate aborted : Error message = Invalid reference for secondPolicyReference ('test-signature'), rest_code:REST_INTERNAL_SERVER_ERROR)

I am not even getting to the merge 🙂 . Still you can try following the GUIDE as my version is 16.1.3 and maybe yours do not have the bug as you need to send "POST" not "GET" Requests and the Content-Type header should be application/json. Other than test with admin credentials in your lab, just as the API user and token may have limited rights or something like that.